EP0835768B1 - Pneumatic tyres - Google Patents

Pneumatic tyres Download PDF

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Publication number
EP0835768B1
EP0835768B1 EP97307968A EP97307968A EP0835768B1 EP 0835768 B1 EP0835768 B1 EP 0835768B1 EP 97307968 A EP97307968 A EP 97307968A EP 97307968 A EP97307968 A EP 97307968A EP 0835768 B1 EP0835768 B1 EP 0835768B1
Authority
EP
European Patent Office
Prior art keywords
tire
carcass
carcass ply
bead
radial distance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97307968A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0835768A1 (en
Inventor
Kazuo Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of EP0835768A1 publication Critical patent/EP0835768A1/en
Application granted granted Critical
Publication of EP0835768B1 publication Critical patent/EP0835768B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0036—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width
    • B60C15/0045—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with high ply turn-up, i.e. folded around the bead core and terminating radially above the point of maximum section width with ply turn-up up to the belt edges, i.e. folded around the bead core and extending to the belt edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10819—Characterized by the structure of the bead portion of the tire
    • Y10T152/10837—Bead characterized by the radial extent of apex, flipper or chafer into tire sidewall
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10819—Characterized by the structure of the bead portion of the tire
    • Y10T152/10846—Bead characterized by the chemical composition and or physical properties of elastomers or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10855—Characterized by the carcass, carcass material, or physical arrangement of the carcass materials

Definitions

  • This invention relates to a pneumatic tire or so-called high-performance tire balancedly satisfying steering stability and ride comfortability with reduction of tire weight and having an aspect ratio of not more than 55%.
  • a high-performance tire is a pneumatic tire particularly attempting improvement of the steering stability by making the aspect ratio small and widening the tread width to increase the ground contact area, and usually uses a carcass comprised of two carcass plies for ensuring sufficient tire rigidity.
  • a carcass comprised of two carcass plies for ensuring sufficient tire rigidity.
  • it is increasingly demanded every year to attain low fuel consumption of a vehicle and hence it becomes important to reduce the tire weight, which is also true in the case of the high-performance tire.
  • it is attempted to develop a high-performance tire using a carcass comprised of a single carcass ply for reduction of the tire weight.
  • an object of the invention to solve the above problem of the conventional technique and to provide a pneumatic tire or so-called high-performance tire having an aspect ratio of not more than 55% and capable of balancedly satisfying the steering stability and ride comfort with the reduction of the tire weight by using a single carcass ply, arranging a turnup end portion of such a ply between an end portion of a belt and a crown portion of the carcass ply, lowering the position of maximum width of the carcass ply, and raising the position of an outer end of a bead filler in the radial direction of the tire.
  • a tire corresponding to the preamble of claim 1 is known from US-A-5361820. This tire comprises a turnup end portion disposed underneath the belt edge.
  • a pneumatic tire comprising a carcass toroidally extending between a pair of bead cores and comprised of a carcass ply, in which an end portion of a turnup portion of the carcass ply wound around a bead core and around a bead filler located above the bead core from the inside toward the outside is disposed between an end portion of a belt reinforcing a tread portion and a crown portion of the carcass ply, characterized in that said pneumatic tire has an aspect ratio of not more than 55%, and a first radial distance (L 1 ) from a straight line (m) connecting a pair of said bead cores and passing through their central positions at a section of the tire in a widthwise direction thereof up to a position corresponding to a radially outer end of the bead filler is greater than or equal to a second radial distance (L 2 ) from the straight line (m) up to the maximum width position of said turnup
  • section of tire in widthwise direction thereof means a section of the tire in the widthwise direction when the tire is mounted onto a measuring rim defined by ETRTO and inflated under an air pressure corresponding to a maximum loading ability at a state of applying no load.
  • Fig. 1 is sectionally shown a typical embodiment of the pneumatic tire according to the invention, wherein numeral 1 is a pneumatic tire, numeral 2 a bead core, numeral 3 a carcass ply, numeral 3a a turnup portion of the carcass ply, numeral 4 a bead filler, numeral 5 a turnup end portion of the carcass ply, numeral 6 a tread portion, numeral 7 a belt, and numeral 8 a crown portion of the carcass ply.
  • the illustrated pneumatic tire 1 is a high-performance tire having an aspect ratio of not more than 55% and has a so-called envelop structure that the carcass toroidally extending between a pair of bead cores 2 is composed of the single carcass ply 3 and the turnup end portion 5 of the carcass ply 3 wound around the bead core 2 and the bead filler 4 located just above the bead core 2 from the inside toward the outside is disposed between an end portion of the belt 7 reinforcing the tread portion 6 and the crown portion 8 of the carcass.
  • the rigidity of the tire liable to be lacking when the carcass is constituted with the single carcass ply can be supplemented by sandwiching the turnup end portion 5 of the carcass ply 3 between the belt end portion and the carcass crown portion 8.
  • the belt 7 shown in Fig. 1 is comprised of four rubberized cord layers 12-15 and a narrow-width rubberized cord layer 16 covering each of both ends of these layers 12-15.
  • the arrangement and the number of these layers and the like may properly be changed, if necessary.
  • end portion of the belt used herein means an end portion of an innermost rubberized cord layer among the plural layers constituting the belt as shown in Fig. 1.
  • the inventor has found that the steering stability and ride comfortability can balancedly be satisfied by properly arranging the distances L 1 and L 2 with respect to a section height H of the tire, or concretely arranging the distances L 1 and L 2 within ranges of 35-45% and 27-45% with respect to the section height H, respectively.
  • the distance L 1 is limited to the range of 35-45% with respect to the section height H is due to the fact that when it is less than 35%, the bead portion is apt to be damaged under a large loading to degrade the bead portion durability, while when it exceeds 45%, the flex zone in the sidewall portion becomes lacking to degrade the ride comfortability.
  • the distance L 2 is limited to the range of 27-45% with respect to the section height H is due to the fact that when it is less than 27%, the maximum width position 11 of the carcass as a bending center is located inward from the height of the rim flange in the radial direction of the tire and hence the flex zone becomes lacking to degrade the ride comfortability, while when it exceeds 45%, the maximum width position 11 of the carcass is too separated away from the rim and hence the sharp steering is degraded.
  • the rubber hardness of the bead filler is preferably within a range of 80-100.
  • rubber hardness used herein means A-type spring hardness measured according to JIS K6301.
  • a pneumatic tire according to the invention is prepared and the performances thereof are evaluated as follows.
  • the invention tire is a high-performance tire having a sectional shape shown in Fig. 1 and a tire size of 255/40ZR18, in which a carcass toroidally extending between a pair of bead cores 2 is composed of a single carcass ply 3 and a turnup end portion 5 of the ply 3 wound around the bead core 2 and a bead filler 4 located just above the bead core 2 from the inside toward the outside is disposed between an end portion of a belt 7 reinforcing a tread portion 6 and a crown portion 8 of the carcass and the distances L 1 and L 2 are 40 mm and 35 mm (L 1 >L 2 ) and are 45% and 39% with respect to a section height H of the tire, respectively.
  • the belt 7 has such a lamination structure that two wide-width rubberized layers 12, 13 each containing steel cords arranged at a cord angle of 22° with respect to an equatorial plane of the tire are laminated so as to cross the cords of these layers with each other and two wide-width rubberized layers 14, 15 each containing nylon fiber cords arranged in parallel to the equatorial plane are laminated thereon and a narrow-width rubberized layer 16 containing nylon fiber cords arranged in parallel to the equatorial plane is laminated on each of both end portions of the wide-width rubberized layers 12-15.
  • the other tire structure is substantially the same as in the conventional high-performance tire.
  • This tire has substantially the same structure as in the example tire except that the distances L 1 and L 2 are 43 mm and 38 mm (L 1 >L 2 ) and are 50% and 44% with respect to the section height H, respectively.
  • This tire has substantially the same structure as in the example tire except that the distances L 1 and L 2 are 23 mm and 20 mm (L 1 >L 2 ) and are 30% and 26% with respect to the section height H, respectively.
  • This tire has substantially the same structure as in the example tire except that the distances L 1 and L 2 are 33 mm and 38 mm (L 1 ⁇ L 2 ) and are 40% and 46% with respect to the section height H, respectively.
  • This tire has substantially the same structure as in the example tire except that the distances L 1 and L 2 are 16 mm and 30 mm (L 1 ⁇ L 2 ) and are 23% and 43% with respect to the section height H, respectively.
  • This tire has substantially the same structure as in the example tire except that the distances L 1 and L 2 are 43 mm and 50 mm (L 1 ⁇ L 2 ) and are 50% and 58% with respect to the section height H, respectively.
  • This tire has substantially the same structure as in the example tire except that the carcass is composed of two carcass plies and the position of the turnup end of the carcass ply is located downward from the maximum width position of the carcass by 10 mm and the distances L 1 and L 2 are 33 mm and 23 mm (L 1 >L 2 ) and are 40% and 28% with respect to the section height H, respectively.
  • Each of the above tires is mounted onto a large-size high-performance sedan type vehicle and run on a test course of dry asphalt road surface at a speed of 50-180 km/h, during which the steering stability and ride comfortability are evaluated by a professional driver's feeling.
  • the steering stability is evaluated by cornering property and handling progressiveness.
  • the tire weight is measured. The results are shown in Table 1.
  • Each of the cornering property, handling progressiveness and ride comfortability in Table 1 is represented by a numerical value in 10-point process, in which the larger the numerical value, the better the property.
  • the tire weight is represented by an index value on the basis that the conventional example is 100, in which the smaller the index value, the lighter the weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
EP97307968A 1996-10-11 1997-10-08 Pneumatic tyres Expired - Lifetime EP0835768B1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP26987796 1996-10-11
JP269877/96 1996-10-11
JP26987796 1996-10-11
JP211609/97 1997-08-06
JP21160997 1997-08-06
JP21160997A JP4070269B2 (ja) 1996-10-11 1997-08-06 空気入りタイヤ

Publications (2)

Publication Number Publication Date
EP0835768A1 EP0835768A1 (en) 1998-04-15
EP0835768B1 true EP0835768B1 (en) 2003-01-08

Family

ID=26518740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97307968A Expired - Lifetime EP0835768B1 (en) 1996-10-11 1997-10-08 Pneumatic tyres

Country Status (5)

Country Link
US (1) US5928445A (ja)
EP (1) EP0835768B1 (ja)
JP (1) JP4070269B2 (ja)
DE (1) DE69718267T2 (ja)
ES (1) ES2188872T3 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4170821B2 (ja) * 2003-05-30 2008-10-22 住友ゴム工業株式会社 空気入りラジアルタイヤ
JP4894194B2 (ja) * 2005-08-12 2012-03-14 横浜ゴム株式会社 空気入りラジアルタイヤ
JP5652148B2 (ja) * 2010-11-17 2015-01-14 横浜ゴム株式会社 空気入りタイヤ
JP6859825B2 (ja) * 2017-04-17 2021-04-14 横浜ゴム株式会社 空気入りタイヤ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5822704A (ja) * 1981-08-04 1983-02-10 Bridgestone Corp モ−タ−サイクル用空気入りセミラジアルタイヤ
JPS5981207A (ja) * 1982-10-30 1984-05-10 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JPS6171202A (ja) * 1984-09-14 1986-04-12 Sumitomo Rubber Ind Ltd 乗用車用ラジアルタイヤ
JP2574816B2 (ja) * 1987-10-27 1997-01-22 住友ゴム工業 株式会社 安全タイヤ
US5361820A (en) * 1991-09-30 1994-11-08 Sumitomo Rubber Industries, Ltd. Pneumatic radial tire
JPH06112405A (ja) * 1992-09-28 1994-04-22 Fujitsu Ltd 半導体装置
US5479977A (en) * 1992-10-30 1996-01-02 Sumitomo Rubber Industries, Ltd. Pneumatic tire with carcass structure for increased sidewall rigidity

Also Published As

Publication number Publication date
DE69718267D1 (de) 2003-02-13
JP4070269B2 (ja) 2008-04-02
ES2188872T3 (es) 2003-07-01
JPH10166818A (ja) 1998-06-23
US5928445A (en) 1999-07-27
DE69718267T2 (de) 2003-11-13
EP0835768A1 (en) 1998-04-15

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